<!doctype html>
<html>
<head></head>
<body>
  <h1>Test content</h1>

  Content verification marker:
  frames-nested2.htm: 6d23dc47-f283-4977-96ec-66bcf72301a4

  <iframe src="b.htm" width="300" height="300"></iframe>
  <img src="1.png"/>
</body>
</html>
